SIEMENS RDG400 Room Thermostat Instruction Manual

: June 9, 2024
: SIEMENS

Table of Contents

SIEMENS RDG400 Room Thermostat Instruction
Operating Instructions
Changing from heating to cooling mode
Control parameters
Parameter list
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SIEMENS RDG400 Room Thermostat Instruction

Operating Instructions

RDG400 – the electronic room thermostat that allows you to set the ideal room temperature you want. The thermostat satisfies your individual needs in all operating modes: Comfort, Energy Saving and Protection mode. You can either rely on the factory settings or make adjustments that suit your individual needs. SIEMENS-RDG400-Room-Thermostat-FIG-1

Changing the room temperature

The setpoint can be adjusted with the rotary knob when Comfort mode active
Turn the rotary knob clockwise (+) to increase, or counterclockwise (-) to decrease the current room temperature setpoint for Comfort mode

The setting range is from 5…40 °C (41 … 104 °F), unless limited by parameters P09 and P10 (parameter Settings, see reverse side).

Selecting Comfort mode

SIEMENS-RDG400-Room-Thermostat-FIG-3

Press the operating mode button until symbol appears, indicating that Comfort mode is selected
In Comfort mode, the thermostat maintains the setpoint which can be adjusted with the rotary knob

Selecting Protection mode

Press the operating mode button until symbol appears, indicating that Protection mode is selected
In Protection mode, the plant stops operating. If the room temperature falls below 8 °C, heating is switched on however to protect the room against frost

The setpoints for Protection mode can be changed by your HVAC installer if desired:
Changes made by installer: Frost protection: ____ °C / °F
Heat protection: __ °C / °F

Selecting Energy Saving mode
In Energy Saving mode, the room temperature is maintained at a lower or higher setpoint, thus saving energy and money. SIEMENS-RDG400-Room-Thermostat-
FIG-6

When selecting Energy Saving mode, make sure parameter P02 is set to 2
Press the operating mode button until appears
You can change the preselected setpoint by adjusting parameters P11 and P12 (for parameter settings, see reverse side)

Important: The setpoint for Energy Saving mode can be set to OFF. This means that the thermostat is deactivated! Risk of frost, i.e. no protective heating or cooling function is provided.

Energy saving tips without sacrificing comfort:

Air out rooms for short periods of time only, but properly, with the windows wide open
Never allow the room temperature to exceed 21 °C (70 °F) through heating, and to fall below 25.5 °C (78 °F) through cooling

Button lock

To lock or unlock the buttons manually, press and hold the right button for 3 seconds. The buttons can be locked or unlocked in this manner if P14 is set to 2
If P14 is set to 1, the thermostat automatically locks the buttons 10 seconds after the last adjustment

Temporary timer for extended presence or absence
The Comfort and Energy Saving modes can be temporarily extended by 0.5 to 9.5 hours using the temporary timer. SIEMENS-RDG400-Room-Thermostat-
FIG-9

To set the temporary timer, press and hold the operating mode button for maximum 3 seconds. While holding the button, turn the rotary knob clockwise or counterclockwise as required.
a) Turn the rotary knob clockwise to extend Comfort mode.
Display: 0….+9:30
b) Turn the rotary knob counterclockwise to extend Energy Saving mode.
Display: 0 ….-9:30
Release the operating mode button and the mode is temporarily changed, indicated by .

After the temporary timer has elapsed, the thermostat will resume in the new operating mode as follows:
Extended Comfort mode
Extended Energy Saving mode
New operating mode = Energy Saving
New operating mode = Comfort

If Energy Saving mode cannot be selected via the operating mode button (P02≠2), Protection mode will be used for extended absence instead!
The temporary timer function is aborted whenever a new setting is made

Note:
Extended Comfort mode is also possible when an external contact such as a keycard switch or central time clock is active. To enable this function, the time for the extended period must be set via parameter P68.

Changing from heating to cooling mode

Depending on the type of plant, the changeover from heating to cooling (or vice versa) is made either automatically by a changeover sensor or a remote changeover switch, or manually by pressing the operating mode button (see parameter P01)
To select cooling or heating manually (P01=2), press the operating mode button until the desired mode appears
With automatic changeover or continuous heating / cooling, symbols indicate that the system currently operates in heating or cooling mode
With manual changeover, symbol appears, indicating that the system currently operates in heating or cooling mode

Control parameters

SIEMENS-RDG400-Room-Thermostat-
FIG-14

To change control parameters, proceed as follows:

Press both buttons simultaneously for at least 3 seconds.
Release them and, within 2 seconds, press and hold the right button again for 3 seconds. The display shows P01.
Select the required parameter by turning the rotary knob.
Press button (OK). The current value of the selected parameter starts blinking and can be changed by turning the rotary knob.
Press button (OK) to confirm the adjusted value, or (Esc) to cancel the change.
If you wish to adjust additional parameters, repeat steps 3 through 5, or press (Esc) to leave the parameter setting mode.

Parameter list

No.| Parameter name| Default value| Setting range| Adj.
---|---|---|---|---
P01| Control sequence| Single-duct / single-duct & H/C coil:

1 = cooling only

| 0 = heating only

1 = cooling only

2 = H/C changeover, manually

3 = H/C changeover, auto

|
P02| Mode selection via operating mode button| 1| 1 = Comfort / Protection mode

2 = Comfort / Energy Saving /

Protection mode

|
P04| Selection of °C or °F| Depends on wizard setting| 0 = °C

1 = °F

|
P05| Sensor calibration| 0.0 K (0.0 °F)| – 3…3 K

(– 6…6 °F)